2020/10/31 by Lizhou Sha, Chelsea X. Huang, Avi Shporer +92 · 14 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Light curve #Photometry (optics) #Physics #Planet #Radial velocity #Saturn #Stars #Stellar, planetary, and galactic studies #Subgiant #astro-ph.EP
paper · pdf · doi:10.3847/1538-3881/abd187
published in The Astronomical Journal 161(2), 82 (Institute of Physics) · 28 pages, 9 figures, 11 tables, accepted by AJ, ancillary data also available at https://github.com/vulpicastor/toi954-data
arxiv created 2021/01/04 · openalex publication_date 2021/01/22 · arxiv updated 2021/01/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of and a mass of M J and is in a 3.68 day orbit, while K2-329 b has a radius of and a mass of M J and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.